AREA FORECAST DISCUSSION

 
 FXUS66 KSGX 222132
 AFDSGX
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SAN DIEGO CA
 200 PM PST SUN NOV 22 2009
 
 .SYNOPSIS...FAIR WEATHER WITH A WARMING TREND THROUGH MID WEEK UNDER 
 BUILDING HIGH PRESSURE WITH WEAK OFFSHORE FLOW. COOLER TOWARD THE 
 END OF THE WEEK AS A LOW PRESSURE TROUGH PASSES TO THE NORTH. 
 
 &&
 
 .DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... 
 ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.
 
 TODAY THROUGH WEDNESDAY...CLEAR AND COOL THROUGH TONIGHT WITH WEAK 
 ONSHORE GRADIENTS TO THE E AT ABOUT 2 MB SAN-IPL AND OFFSHORE FROM 
 THE N WITH ABOUT 1 MB SAN-TPH...TRENDING OFFSHORE. 
 
 FLAT OR WEAKLY CYCLONIC NW FLOW ALOFT TONIGHT WITH GRADUALLY 
 INCREASING HEIGHTS AND WEAK OFFSHORE FLOW FROM THE NORTH WILL BRING 
 CLEAR AND COOL CONDITIONS WITH A FEW HIGH CLOUDS. CLEAR MONDAY 
 THROUGH WEDNESDAY AS AN UPPER LEVEL RIDGE OF HIGH PRESSURE MOVES 
 OVER THE WESTERN U.S. WEAK TO BRIEFLY MODERATE OFFSHORE FLOW WILL 
 DEVELOP MONDAY AND CONTINUE THROUGH WEDNESDAY. OFFSHORE WINDS WILL 
 BE MAINLY GRADIENT DRIVEN WITH WEAK UPPER LEVEL AND THERMAL SUPPORT. 
 THERE WILL BE LOCAL GUSTY OFFSHORE WINDS THROUGH AND BELOW MOUNTAIN 
 CANYONS AND PASSES...ESPECIALLY TUESDAY AND WEDNESDAY MORNINGS WHEN 
 THERE WILL BE A LITTLE BETTER UPPER SUPPORT. MOST WINDS ARE EXPECTED 
 TO REMAIN BELOW ADVISORY STRENGTH WITH ISOLATED GUSTS OF 30 TO 40 
 MPH IN THE FAVORED AREAS BELOW THE CAJON PASS...BANNING PASS AND IN 
 THE SANTA ANA MOUNTAIN CANYONS. A LITTLE WARMER MONDAY THEN MORE 
 WARMING TUESDAY AND WEDNESDAY W OF THE MOUNTAINS. COOL AT NIGHT IN 
 AREAS PROTECTED FROM THE WINDS. THE WARM DRY OFFSHORE FLOW WILL 
 INCREASE THE FIRE WEATHER HAZARD TUESDAY AND WEDNESDAY. 
 
 THURSDAY THROUGH SUNDAY...HIGH PRESSURE ALOFT AND WEAK OFFSHORE 
 FLOW WILL CONTINUE THROUGH MID WEEK. THURSDAY WILL BE THE WARMEST 
 DAY IN MOST AREAS WITH MAX TEMPS INLAND FROM THE COAST ABOUT 6 TO 12 
 DEGREES ABOVE SEASONAL AVERAGES. THE LONG PERIOD OF WARM DRY 
 OFFSHORE FLOW WILL MAINTAIN AN ELEVATED FIRE WEATHER HAZARD THROUGH 
 THURSDAY. COOLER WITH HIGHER HUMIDITIES...INCREASING HIGH CLOUDS AND 
 A FEW MARINE LAYER CLOUDS FRIDAY THROUGH SUNDAY AS A LOW PRESSURE 
 TROUGH MOVES THROUGH TO OUR NORTH AND ONSHORE FLOW BRIEFLY RETURNS. 
 
 &&
 
 .AVIATION...
 222000Z...OFFSHORE FLOW FORECAST TO INCREASE TONIGHT THROUGH MONDAY 
 MORNING. EXPECT CLEAR SKIES THROUGH TUESDAY EXCEPT FOR POSSIBLE 
 DENSE FOG ALONG THE SOUTHERN SAN DIEGO COUNTY COAST WHICH COULD 
 AFFECT KSAN TONIGHT THROUGH EARLY SUNDAY MORNING UNTIL ABOUT 16Z. 
 
 &&
 
 .SGX WATCHES/WARNINGS/ADVISORIES...NONE.
 
 &&
 
 $$
 
 PUBLIC...PG
 AVIATION...WHITLOW